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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82c5aaad2b6f454509bc70a6d254159ba17aab680128e01c4153c04abc9b43bf' 
  AND token = 'AQWs79Q15xDReQAWdA6THGfUCQ7+Sj6WJiABGdOcOy0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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