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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0392c2fb12fc4df3c23210707a35c236b8ba273496fcd0e8176d1bffd913eba' 
  AND token = '46a1UV04d/fbCNdWadguF4ylj7TTBbzlOiMAJNFjxHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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