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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5956f5019b98f45c54f9bb3b207e552dba9945a7aa51fb4a7fb615a7338468a6' 
  AND token = 'Yu3ccg5wDsspkoKcxa4VMz90g7nl3o1+Ksme13RbtY8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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