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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb194d11fc6cff805c609da8fa335badcef9091dae8bac07e57ff16fd9b80e8c' 
  AND token = 'uVC7eXhTnH1WAii3KlphxXbORtTZtjSIBeNEWhG9/JM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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