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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5e432f95776da2eacf5034d8be7d88a24fe627c24b28722c87bc8c11ff008f5' 
  AND token = 'OOGE2y3g+7g6LBlapkxf0ZQdHCMJrIKIRD9dJT8I7xs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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