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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '126e132499301a294e33d32377bde76acb18b2df9bdf52491e57ec2ea641b738' 
  AND token = '3xQKkZugX9hIapM3Vd86vYrF07dcifMLRE0t8s96CK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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