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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e60b90e3d56a9a2b999fd746b1e99fd6ea3a161662eb9f9d42af01c933a3e93' 
  AND token = 'f8FU8geXom4Hlg6Rg8cP+t2OpHGDZq6l3L3IZFylc40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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