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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1da87edf28686c220a56b43ef3d540e77a20282238cbd2a76cd0eefc80457b00' 
  AND token = 'HZNGVcGc6F12kHWFYMly8xnpUD8NLm4Q4+JrkhgJOQg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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