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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c313e86021d4c38297c6b874ce54caa1882b5c671a3c10cec422c16dc6142080' 
  AND token = 'ZKsqLaOW4el8ySnqnjyGfoDDlsBpaUDrmDhrtpQAAtU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00515

JSON explain

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