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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bfb8932057b9644cb113995e8c50279df4d4a6a6825ee554a3779c563bd412c' 
  AND token = 'iNhAkL6yJ3OA+VMAQrM9pO+CBU8Euq5P/XbIX4pG2Tc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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