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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67ecbd8a82f4ecc18b255b6826f0f47c9eef56779b8ee3ee162b1d3974433a3e' 
  AND token = 'StwtVaJb3IXY5DtDEHzRN1cg7EIMp6s+h+tM+EsTVjE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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