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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca02bfdeb3739de5c5e0eb20261d3d587f79e38749ddd355953fc5913223141d' 
  AND token = 'Az5c1yNQTksb7aSWnAPIFiOolg6XdpvaSqetYQGnz4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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