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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cec3943da4d69cbd13b31cd1d2c5c3d40c97372a98a93db104c8888cbbe4c31e' 
  AND token = '33/4iDxoOJarq38XwL4KXErTw68gG5n6aFwRE1Ub3i0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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