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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc50e89e2742bff408471e8a768fbbf9f078c8e0b8c6f24722574fa821fec535' 
  AND token = 'yom7/SGV8T1LO7sZpoE2JuyUfs4J/J2goFYTee0VcCw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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