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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d96bb9b8a0ab55bb97ca2bc199887e74208bed99c862f0bad8bd694554a5b9d' 
  AND token = 'jCIO4tLdxCDYQYl9LWf8wxsoeqXoCsBnpEsTKWjTyds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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