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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '362781efd9f6b1399dd8311d04592df5928c16ac6cf26eb4c9d2537c33298d90' 
  AND token = 'm+jZAIn7IpOOfAcJLGcslF2QJARLlro06t6JKDwWs0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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