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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86d86c6908b2e66dac639522ba4bc2ce56f3d2976a54c0d917dcfa0ff667ddca' 
  AND token = 'K98IKEeWSoizzv3eG7R5KqljEpg+F2CoJexk4374zvQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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