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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ba6867f11b5d18ae18c32b59f95b7a916a0f3ab6152309c57f84e82d075a4f8' 
  AND token = 'CAvSW9MUg8NdNEDWDdwwO9dX/h1A2qhaBZXT9y9OgAQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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