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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c0125dd630b0fef4b56f37e6202b65fa49e3da9676f80c18eb0a73a710053c4' 
  AND token = 'NL29atrdnP13mhNwHxuZ45DfoFmj4sQa6Q2cIgF/huI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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