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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a13c5b37d2013c2eae4ec3a5e3d3354dfbc5b567f86024cfc1b0ad7e466038f9' 
  AND token = 'O+VyFM7nG2Fq8C4Mpw0S8yFpbuYTNTH5U2u2n3klnes=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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