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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a51ca8cddf53d9a5c6b7dc885edc92028ec7930a7592ca77378ef9d7ee09126' 
  AND token = 'MEgwlUcEolfUQpsn3ZWZ7v2GKHdsayujX0k4VvZ2X4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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