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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31c62cb627aea97230e6d0aa9a423f631731591974177586a9f82ad8136a6385' 
  AND token = 'IYuQV3KrYoZAj59FgJ1r6zOgWgt/YU64dLIi2q/F0Ag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00116

JSON explain

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