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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0bada217b83c13430aa357bc61cc2a2ae6154a8077e3e95a1a02e744f03d8f0' 
  AND token = '9gCOCyzNsAO3PP6YdmZPid+mf9rC5pl64se8B7ar5wo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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