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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6afffcc609bd4b8bba91c31fdd4240d8cd59283db833554898e8aa9d556753f0' 
  AND token = 'bi9LexHLfEJ8Q4tJ3ib4AhF3K+bmw1GT2oC/tPIeOGg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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