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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd18a54d0ebb13bf32d218c8e6ecf810483beb71cb65def1f205f725065965d5b' 
  AND token = 'tsdadVJnanAYYbIy1P/02rc7tiyXtwbuBV9qnSltFBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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