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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '011739b5b5656fb7521479a4517e9e2271f508c052ab075e4ff761b4e46ea871' 
  AND token = 'W4amK8SWx16Fz5ERQiNS/QN+At2CMk1JVVemN3UqfFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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