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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4ec013d6b8c53f6a27737f1862f5448dac41ab92174d2523012404ec4431e24' 
  AND token = 'lZUWA0dC3+oSh2qRlCZmf8V0IaplTZpFMMNblI7KNbI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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