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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56dd0edfa496a79c06d50fc03c490cb287dafe9934dbcfa88d8070719f4dd159' 
  AND token = 'vUqbHSncFm85bMFlCPsRLjJ2ixLzjQWn9ZoMGH4IKmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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