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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0feb778f6188f5f1c1a9fee313a24beb31ff2b3ffb8cc54c2f6955398ddb17b3' 
  AND token = 'OlBK6LbPAkKRF7BxDp+xG7sO0fMie52lVA/Y0rTyCwI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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