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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6c61b82f941f6dbb9250a10a2c14c6822149aacb0e6c6e663bd9ac7081d909a' 
  AND token = 'fbji3kyYP/aKnsutB+h6vHSv9XNi5mHb4TAVS1LWzS4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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