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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e06d089294d96e450b801f21bc1967787ba4be7c77509f64c7581c08e1fe1c5' 
  AND token = '7vNxtUtok0PCetXMEwtJGMek9IoqDwFVUVUIaFYKDDY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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