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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdae548bdd0fae48f103ee4097cfd860cf74bd81989f46e8e9ad13ef9260f04f' 
  AND token = '0urgQ/GkJ/+ga48ouyIFlN2nvDBv5qsuFhG+Cv3LIfE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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