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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd15d326e6a39389e8eb8130f1cd322a1d2aa9bd5e5b846f2526fe2a5463b9ca2' 
  AND token = 'cRn7rrPLmiNEcPG5b52vpYwOlc7TZr//OMdVNKVZiso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}