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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4b27f29ff23887ea35684e08e5f0dec79d9c2ef679fe1cd181d11a533710ccb' 
  AND token = 'jduP735FBGKx/eo65UCN9ReTwR4J0WobAESZAOzavY8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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