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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d7c2a81029dceabb0554d4bed8709ca6b270afed1b66b4175e72895e5aeb202' 
  AND token = 'QNcCma9C5WzcVkx1KZuH93VpgWgsf7cc9WJ3ZzsPBkw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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