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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d5eda32a3b1800ee7ceb9187495f154f72885ca4e2fa2a8f3f2ce88fa42e3ee' 
  AND token = 'vte2u4LJIoRLdwJLlBFCIyQcvrL3YuqhHVdz+Z+Df6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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