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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfc2fdce58c38c1be73aa08189d842703941445799ff8ac6620d365544790de0' 
  AND token = 'f9asy4DijFw6D5TMEc1umNMYTlwDgvP86F1QMRI+SJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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