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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f71fe27a994b8b8a2f759deb307c1eda3e8709d7b6677cfff59f25d312319f8d' 
  AND token = 'T8sIR1e/kHh04q1tnPYTJ3JLv8gRHj5n67QHHvvxHoo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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