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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ade6c0efb6fb731d27b8f4d1ce42facac9a15497504bde75532db5d2c86824ec' 
  AND token = '28+uainn7+pPKA6qxQkKdzTyhlPdl+wHr99BEf0+qQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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