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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b70d57f24755c3a4f1c64b2f9d385527754c684755d60e5ee1058904705e5c43' 
  AND token = 'G695rX2+l+lvB8Az6krVnV71Mz/NxDON87ghPzuc+9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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