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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5eee1dc446691d0eb3d79c65d485827a7e4e7cb7ac7eb661a1c0a834c1ba562f' 
  AND token = 'z6ooyAGuK12K585v33ed50WHsfehU/LvsoaENKwO+4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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