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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ade1d432dea4e44016549a4f05beae5cc5de60d9a2e49c2b1367303eec390770' 
  AND token = 'R34D4dfdteX/XbuzL8GiI7hHOfNJEsp4jOUFrOwI/0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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