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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdfabd93356cfa1288ec72f27598c892231ba5ed11fecb671037c4efcd4686a4' 
  AND token = 'CXmQm7oM0891buk+u9XdEf4giK86PcZ1SLG2LBGAC+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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