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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f42359d7824980d2fca0d2d275a413cad652f2da1494fd530e3f7b7a3b55c03' 
  AND token = '2D8BiR9pwXDryUjyTecuAF15c4/6QFIpSuwwejtSCoI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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