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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '053608eb196f7ef55923ccbace84d1dd81059050181692174db959615eb12cef' 
  AND token = '+7k6gUfl92fbr3E+eOpGwuU2Nru/OSsSRwkLFGiVoXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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