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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7fd66cb5e5893a80b51002f2ba52ddf2d14e6bcccc5caf3c8d5f8295c74db4c' 
  AND token = 'Wi6wt3UrLmpCdca0CQy9VigXiz19WnIC92cdkh9JQIM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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