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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90788b9fd2540aafc11064e64d4f97cded77348a956b9042422f9b33918cf9a5' 
  AND token = 'QR8OYhxr3rA6W6yUBHU9THMWT/wtg05EQj5Y/3dDd1Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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