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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3400bc0534481398704ceb57ce3328b0a470e5439c09e3ccb6836f6279930c72' 
  AND token = 'se7Pue+FX8z2LA5YsNeV2X/D6ZI6BW2FxMFysvNcuzY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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