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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2ce7c4cd7bd4eca87871a810be5d76c88829a063f53ad4ab92b36d1afd17313' 
  AND token = 'FGDUNcZDoZlQF+AbS0KYIDDzCZNxF1nAFo+/kHetwSo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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