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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8db1ce392c91a5e151957ba9d2557c30e112aec8500b6dbd56b37065e1e4e936' 
  AND token = 'B5afZQqC0w/SuNccRzWBaU9iRhs2A1p5C2VgMF0pM2A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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