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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '698dd0fbee2e0f46a7b9f6b8d8eba1052bf1585d9325a42e7794978df89c8ed2' 
  AND token = 'IdgPeXvvUSl70GTUFIdaTYXgH130BvAwY6IyxvMMy1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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