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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1662a6edda55f43b79a0c34a22e7b5d2e98577c3b8cd9c78018e4a92ce2e0705' 
  AND token = '3j3zLW7eCSjLYR6SfUWtbKS/ewku27YdO/j6zLS4KX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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