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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c09abeb1a3da525071159b8f0c60d027bcf9ed56c5411560e19455721bae840' 
  AND token = 'Y/gQYMO47KSy6Y4w4P7UMcfacd4KO8fP4q/7Fouzo6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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