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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '417abf8f908248115dc3f9bbd7119caa798093e92191c94445ee653022e031bf' 
  AND token = 'fE0WbWhqpknfe8i6VkH+2TDzS5emAgRiXZ4M/q2NsVk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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