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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c411f71c9f385ea140df00d45af7b0176c25e2c4185285965c62292b3e7c7e2' 
  AND token = 'rTVsen7EVhG3ORetg3a4FBCdCC3Jc9UJLqBWxr/4+jE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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