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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df01ab9f694c408a91de57fa9027293c5a82ec8b7f63c14ce8fdf38469500d82' 
  AND token = 'QIvfQBv/g0Fqd0XnHfHg0UCkkHefmQ+HDs070W2vwto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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