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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b88275397439e552a274f454157c691d7a65722a2de8fa25806b867f0f41e1a' 
  AND token = 'SPv5jeykCcJvo1hJClhY4mMF0kDkd9U+muwlp6bibr0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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